What have been your favorite communities built around an individual game? Was it an MMO, like World of Warcraft? Or a shooter, like Halo 2? Or some other genre? And what did you like about your social interactions in that game? Was it highly competitive, or especially supportive to new players? Was it fun because it was a large community, or because it enabled lots of smaller interactions and the development of friendships?

And finally, how did that social community affect the way that you played the game?